Using CSOM API - SiteCollection User Roles update fails

Question

Hi ,

I'm looking for CSOM API or sample code snippet for updating User Roles for a Site Collection

Tenant Admin URL: https://<tenant>-admin.sharepoint.com
SP URL : https://<tenant>.sharepoint.com/Sites/SiteCollection1

Technologies using: C#, CSOM API for ShrarePoint Communication

From Sharepoint UI:
I can update user role Definition from UI

Things I tried using CSOM API:

1. Logged into above mentioned SP tenant admin URL using admin account (URL: https://<tenant>-admin.sharepoint.com)
2. Using Site Collection URL (https://<tenant>.sharepoint.com/sites/SiteCollection1), tried changing/Updating User Roles Definitions
3. Same code works fine that is can Successfully update User Role Definitions for SubSite (URL: https://<tenant>.sharepoint.com/Sites/SiteCollection1/SubSite-A1)

Error/Exception :
Cannot change permissions of root web: https://<tenant>.sharepoint.com/Sites/SiteCollection1

Code Snippet for Quick Reference
SP.RoleDefinitionBindingCollection collRoleDefinitionBinding = new SP.RoleDefinitionBindingCollection(this);
SP.RoleDefinition roletypes = this.Web.RoleDefinitions.GetByType("Editor");
collRoleDefinitionBinding.Add(roletypes);
spOClientContext.Web.RoleAssignments.Add(checkuser, collRoleDefinitionBinding);
spOClientContext.ExecuteQuery();

Thanks,

Answer 1

Hi @RaytheonXie_MSFT ,
Yes i broke Inheritance using Web.BreakRoleInheritance(true, true)

Note:
For sub-sites this works fine, able t update Roles.
Fails for Site Collections

Thanks,
Madhu

Answer 2

Thanks RaytheonXie-MSFT for your response.

I have implemented by same as above mentioned code snippet.

Code snippet works for Sub Sites - https://<tenant>.sharepoint.com/sites/SiteCollection1/subsite1

Fails for SiteCollection -https://<tenant>.sharepoint.com/sites/SiteCollection1

Failure Error Message: Cannot change permissions of root web: https://<tenant>.sharepoint.com/Sites/SiteCollection1

Did you tried for with Site Collection input argument.

Thanks,
Madhu

Answer 3

Hi anonymous userJN
Per my test, please use following code to assign role to sharepoint online user by csom

Web web = context.Web;     
Principal user = context.Web.SiteUsers.GetByLoginName(@"X");     
RoleDefinition readDef = context.Web.RoleDefinitions.GetByName("Editor");     
RoleDefinitionBindingCollection roleDefCollection = new RoleDefinitionBindingCollection(context);     
roleDefCollection.Add(readDef);     
RoleAssignment newRoleAssignment = context.Web.RoleAssignments.Add(user, roleDefCollection);     
context.ExecuteQuery();       

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

---